Strange that the producer you mention also produces thyratrons… I think from the beginning that using them might be a very good option for Focus fusion. They are reliable and have been used by the industry for many years now.
By digging in Google, I also found an old (and now in free domain) patent to enhance thyratron technology, for using it in Focus Fusion devices:
http://www.patentgenius.com/patent/4446096.html
